Storage of electric motors

When motors are not put into service within three or four weeks after being manufactured and shipped from the factory, they are considered to be "in storage". This can occur when a motor is awaiting installation, or after it is installed, but regular operation is delayed pending completion of plant construction, or there are long idle periods between operating cycles, such as when a plant is shut down. Several precautions are necessary to prevent deterioration of motors in storage. The extent of precautions taken depends on the duration and ambient conditions of planned storage. Of particular concern is the protection of the insulation system, bearing system, bare machined surfaces, and preventing the entrance of dirt, rodents, birds, etc. into the motor. This paper covers storage precautions for various conditions, including: short and long term storage; various ambient conditions in the storage area; insulation protection; space heaters; bearing protection, oil lubricated bearings, and grease lubricated bearings; protection of unpainted machined surfaces; and long term protection of metal surfaces.<>